Rainbow Electronics AT75C310 - Manual (Page 69)

AT75C310
69
• TXEMPTY: Transmitter Empty
0 = There are characters in either US_THR or the Transmit Shift Register or a break is being transmitted.
1 = There are no characters in US_THR and the Transmit Shift Register and break is not active.
Equal to zero when the USART is disabled or at reset. Transmitter Enable command (in US_CR) sets this bit to one.
• DMSI: Delta Modem Status Indication Interrupt
0 = No effect.
1 = There has been a change in the modem status delta bits since the last “Reset Status Bits” command.